FLAGSTAFF, Ariz. – It's been 75 years since the discovery of Pluto (search), but it remains a mystery. Perhaps in another 10 years some of its secrets will be revealed when a space probe gets close ...

Do you miss Pluto? In 2006, the International Astronomical Union voted this bantam world off the island. It was no longer a planet — a peer of Mars, Jupiter and the rest. From then on, Pluto was to be ...

In the continued search for the hypothetical ninth planet in our Solar System, Michael Brown, the CalTech astronomer who led the demotion of Pluto to a dwarf planet in 2006, has co-written a new study ...

In 1999, when the new Browns expansion franchise was preparing for its first season, the team was looking for a quarterback.

A NASA spacecraft speeding toward Pluto is casting a wary eye on the dwarf planet system, looking for anything that could trip it up in the home stretch of its historic mission. NASA's New Horizons ...

The coast looks clear for a NASA spacecraft's historic Pluto flyby less than two weeks from now. The New Horizons probe has spotted no signs of rings or additional moons in the Pluto system, so the ...

Scientists have recently unveiled a remarkable discovery in the outer reaches of our solar system: a space fossil located 4 billion miles past Pluto, covered in unidentified organic molecules. This ...

In just about a year, the New Horizons spacecraft will begin daily observations of the dwarf planet Pluto. A month later, on 14 July 2015, the piano-sized 478-kilogram probe will fly by Pluto at a ...